VxWorks I/O 디바이스 드라이버의 개발방안 및 성능분석

정재엽 한국항공우주학회 2011 한국항공우주학회 학술발표회 논문집 Vol.2011 No.11

실시간성이 중요시 되는 항공전자시스템에서 실시간 운영체제(RTOS:Real-Time Operating System)의 사용은 필수적이며, 그 중 Wind River 사의 VxWorks가 대표적이다. 운영체제를 사용하는 시스템에서 실시간성에 영향을 미치는 요소는 다양하다. 그 중 응용프로그램에서 I/O 디바이스 드라이버의 호출은 필수적이고 자주 발생하므로 호출 시간을 줄이는 것은 실시간성을 보장하기 위해 중요한 요소라 할 수 있다. 이에 본 논문에서는 I/O 디바이스 드라이버 구현 방식(Custom Interface Driver, VxWorks Interface Driver)에 따른 실시간성에 대한 영향을 분석하고, VxWorks를 사용하는 시스템 설계 시 최적의 I/O 디바이스 드라이버 개발 방안을 제시한다. In avionics system, the use of RTOS(Real-Time Operating System) is essential and Wind River's VxWorks is representative. The system using RTOS has a variety of factors which affect to the real-time. Among them, I/O device driver is an important factor. Because It is frequently called by application. Therefore, it is essential to reduce the time of the I/O device driver execution time. In this paper, we analyze the effect of real time according to the I/O device driver implement method. And we propose the method of I/O device driver implement method when you design the system.

저가주와 고가주가 수익률에 미치는 영향

정재엽 啓明大學校 産業經營硏究所 1997 經營經濟 Vol.30 No.2

SUMMARY This study tries to examine that the excess return of low-priced stocks shows the systematic difference from one of high-priced stocks. Sample periods are 24 months from January 1994 to December 1995. Using randomly-selected 120 stocks listed on the Korea Stock Exchange, the empirical results here show that the excess return of low-priced-stocks portfolio or high-priced-stocks portfolio is not statistically and economically significant. It is also shown that the average excess return of low-priced-stocks portfolio. And, it is confirmed that the cumulative excess returns of these portfolios do not show the systematic pattern of change. These empirical results do not stand together with the general belief that low-priced stocks have higher excess returns that high-priced stocks. The empirical evidences here may back the argument that it is not proper to deny the weak form efficiency of Korean stock market. This study tries to examine that the excess return of low-priced stocks shows the systematic difference from one of high-priced stocks. Sample periods are 24 months from January 1994 to December 1995. Using randomly-selected 120 stocks listed on the Korea Stock Exchange, the empirical results here show that the excess return of low-priced-stocks portfolio or high-priced-stocks portfolio is not statistically and economically significant. It is also shown that the average excess return of low-priced-stocks portfolio is not significantly higher than one of high-priced-stocks portfolio. And, it is confirmed that the cumulative excess returns of these portfolios do not show the systematic pattern of change. These empirical results do not stand together with the general belief that low-priced stocks have higher excess returns than high-priced stocks. The empirical evidences here may back the argument that it is not proper to deny the weak form efficiency of Korean stock market.

資本構造에 대한 理論的 考察

鄭載燁 啓明大學校 産業經營硏究所 1983 經營經濟 Vol.16 No.1

To pursue the overriding goal of a firm, wealth maximization to shareholders, a financial decision maker should strive to maximize the market value at the same time minimizing the cost of capital. The theory of capital structure is, therefore, based on the valuation of a firm and the estimation of the cost of capital. A number of studies habe dealt either directly or indirectly with the guestion of whether leverage affects the cost of capital and the valuation of a firm. The traditional presumption is that a firr's value is a concave function of its financial leverage. and that an optimal leverage and Miller, in their famous 1958 article, esfablish that the total value of the firm, in the absence of taxes, is independent of its capital structure. MM (1963) have shown further that a propotional corporate income tax provides sufficient economic incentive for firms to maximize their use of debt financing. In our world, however, to reap more of gains from leverage the stockholders must incur increasing risks of bankruptcy and the costs, direct and indirect, of falling into that unhappy state. The balancing of these bankruptcy costs against the tax gains of debt finance gives rise to an optimal capital structure, just as the traditional view has always maintained, though for somewhat different reasons. We do not, after all, observe firms with 100% debt in their capital structure as the original MM model suggest. Miller (1977) modifies this result by introducing personal as well as corporate taxes into the model. The implications of Miller's argument are that: (1) in eguilibrium, under a set o fairly realistic assumptions, there is no optimal leverage from the point of the firm, and (2) there may be an eguilibrium amount of aggregate debt outstanding in the economy which is determined by relative corporate and personal tax rates. Although no completely satisfactory theory has yet been found to explain the existence of optimal capital structure, casual empiricism suggests that firms behave as though it does exist. In fact because of capital market imperfections, the existence of bankruptcy costs, there might be such a thing as an optimal capital structure which contains both debt and equity.

거래량과 소외기업효과

정재엽 啓明大學校 産業經營硏究所 1998 經營經濟 Vol.31 No.2

작업치료과 대학생들의 전공선택동기와 대학생활적응과의 관계 및 전공만족도의 매개효과 분석

정재엽,이혜경 대한작업치료학회 2022 대한작업치료학회지 Vol.30 No.1

Objective: The purpose of this study is to investigate the mediating effect of the level of satisfaction of collegestudents with their major between the motivation behind their major selection and their adjustment to school life. Method: A total of 262 college students who will be majoring in occupational therapy in the capital area were usedas the subjects and were given a survey. An analysis was conducted to determine the correlation among thedifferent factors considered. A hierarchical multiple regression was employed to measure the mediating effect ofthe students’ satisfaction with their major on the relationship between the motivation of their major selection andtheir adjustment to school life. Result: According to the results of this study, statistically significant positive correlations were found among themotivation of their major selection, satisfaction with their major, and adjustment to school life. In addition, theirsatisfaction with their major produced a partial mediating effect on the relationship between their satisfaction withtheir major and their adjustment to school life (β = .334, β = .371). Conclusion: This study confirmed that adjustment to school life was affected by the motivation behind the students’major selection and satisfaction with their major. In addition, satisfaction with their major is partially mediatedbetween the motivation behind their major selection and satisfaction with their major. Therefore, to improve thestudents’ adjustment to school life, it is important to know the interactive role behind the motivation to select theirmajor, as well as their satisfaction with their major, and the source of such satisfaction. 목적 : 본 연구는 작업치료과 대학생들의 전공선택동기와 전공만족도, 대학생활적응 간에 어떠한 관계가있는지 알아보고, 전공만족도가 전공선택동기와 대학생활적응의 관계에서 매개효과를 갖는지를 검증하는것이다. 연구방법 : 수도권 소재 전문대학의 작업치료과 재학생 262명을 대상으로 설문조사를 진행하였다. 자료분석은 변수들 간의 상관성을 알아보기 위하여 피어슨 상관분석을 실시하였으며, 다음으로는 전공선택동기가 대학생활적응에 미치는 영향에서 전공만족도의 매개효과를 알아보기 위해 위계적 회귀분석을 실시하였다. 결과 : 작업치료과 대학생들의 전공선택동기, 전공만족도, 대학생활적응도의 평균은 각각 3.20점, 3.56점,3.28점이었으며 전공선택동기와 전공만족도, 대학생활적응도 간의 상관관계는 유의미한 정적 상관성이있는 것으로 나타났다. 그리고 전공선택동기가 대학생활적응에 미치는 영향에서 전공만족도의 부분매개효과가 나타났다(β = .334, β = .371). 결론 : 따라서 작업치료과 대학생들에게 전공선택동기는 대학생활적응에 직접적인 영향을 주고 있을 뿐 아니라 전공만족도를 통해서도 대학생활적응에 간접적인 영향을 주고 있음을 시사한다. 본 연구결과는 전공만족도는 대학생활적응을 높이는 요인임을 확인하였으며, 대학생활적응을 높이기 위해서는 전공만족도의 역할이 중요하다.

VAR모형을 사용한 주가변동과 거래량간의 인과관계분석 : Estimation of VAR model

정재엽 啓明大學校 産業經營硏究所 2003 經營經濟 Vol.36 No.1

This paper tests for the causality in the relation between stock price changes and trading volume. Estimation of the volatility in daily KOSPI returns and in daily trading volume changes is performed by GARCH model. Then, the relation with stock returns, stock returns volatility, trading volume changes, and trading volume changes volatility is analyzed by VAR model. The empirical results show that current volume changes are significantly related with lagged stock returns. Especially, current volume changes volatility is significantly related with lagged stock returns and lagged stock returns volatility.

기업회생 과정에서 협상 상황이 협상 성과에 미치는 영향: 협상자 유형의 조절효과

정재엽,김동재 한국전략경영학회 2022 전략경영연구 Vol.25 No.1

We investigate how the negotiation situation affects negotiation performance during a corporate workout following a near-bankruptcy. Using survey data collected from 300 executives of debtor companies who participated in negotiation at the start of the corporate workout program, we examined the effect of the negotiation situation on negotiation performance, with a focus on examining the moderating effect of the negotiator type. According to our findings, information sharing, negotiation objectives, time constraints, and relative dependence all had a statistically significant positive (+) effect on negotiation performance. Furthermore, we discover that the effects of information sharing, negotiation goals, and relative dependence on negotiation performance vary depending on whether the negotiator is a problem-solving, competitive, or concession negotiator. This study broadens the scope of negotiation research by shedding light on the relationship between the negotiation situation, negotiator type, and negotiation performance during the corporate workout process. Our research also has practical implications for practitioners involved in corporate workouts. 본 연구는 경영악화로 인한 기업회생 과정에서 채무자인 기업과 채권자 간의 협상과정과 성과 간의 관계를 분석하는 것을 목적으로 하였다. 이를 위해 협상상황이 협상성과에 미치는 영향과 협상자 유형의 조절효과를 분석하였다. 분석을 위해 기업회생을 위한 협상에 직접 참여한 회생기업의 임원 및 대표이사 300명의 자료를 수집하여 분석하였다. 분석결과 협상상황인 정보공유, 협상목표, 시간압박, 상대의존도 모두 협상성과에 정(+)의 유의한 영향을 미치는 것을 발견하였다. 또한, 협상자 유형의 조절효과를 분석한 결과 정보공유, 협상목표, 협상성과에 대한 상대적 의존도는 협상가가 문제해결적 협상가인지 경쟁적 협상가인지 양보형 협상가인지에 따라 차이가 있음을 발견하였다. 본 연구는 기업회생 과정에서 협상 상황, 협상가 유형, 협상 성과 간의 관계를 조명함으로써 협상 연구의 범위를 확장한다. 또한, 본 연구는 기업회생 과정에 참여하는 실무자들에게 실질적인 영향을 미칠 것이다.

스타트업 창업자의 전략적 리더십 효과

정재엽 한국전략경영학회 2023 전략경영연구 Vol.26 No.2

From the viewpoint that a start-up is a small company in the early stage of business based on innovative technology, and the founder's competency plays an important factor in determining success, this study aimed to identify the founder's strategic leadership effect. The results of analyzing the data of 342 start-up founders are as follows. First, it was found that the strategic leadership of start-up founders has a positive (+) significant effect on innovation performance and corporate performance and a positive (+) significant effect on technological innovation capability. Second, technological innovation capability was found to have a positive (+) significant effect on innovation performance and corporate performance. In the additional analysis, the mediating effect of technological innovation capability was confirmed in the process of strategic leadership affecting innovation performance and corporate performance. These results suggest that the strategic leadership of start-up founders is a significant factor for success through innovation, so the founders should predict the future based on strategic leadership and strive for bold investment in core technologies and human resource development. 스타트업은 혁신적인 기술을 바탕으로 하는 창업 초기의 소규모 기업으로 창업자의 역량이 성공을 결정하는 중요한 요인으로 작용한다는 관점에서 본 연구에서는 창업자의 전략적 리더십 효과 규명을 목적으로 하였다. 분석을 위해 스타트업 창업자 342명의 자료를 분석한 결과는 다음과 같다. 첫째, 스타트업 창업자의 전략적 리더십은 혁신성과와 기업성과에 정(+)의 유의한 영향을 미치며, 기술혁신역량에도 정(+)의 유의한 영향을 미치는 것으로 나타났다. 둘째, 기술혁신역량은 혁신성과와 기업성과에 정(+)의 유의한 영향을 미치는 것으로 나타났다. 추가분석에서 전략적 리더십이 혁신성과와 기업성과에 영향을 치지는 과정에서 기술혁신역량의 매개효과를 확인하였다. 이러한 결과는 스타트업 창업자의 전략적 리더십 이 혁신을 통한 성공에 매우 중요한 요인이므로 창업자는 전략적 리더십을 바탕으로 미래를 예측하고 핵심 기술에 대한 과감한 투자와 인적자원 개발에 노력하여야 한다.

주식수익률과 주식수익률 변동성에 대한 거래량 정보효과

정재엽 啓明大學校 産業經營硏究所 2004 經營經濟 Vol.37 No.1

This paper tests for the information effect of trading volume on stock returns and stock returns volatility. Each period divided by price limit from April 1995 to October 2003, AR model is used for daily KOSPI returns and daily trading volume changes to remove autocorrelation. Estimation of the volatility in daily KOSPI returns and in daily trading volume changes is performed by EGARCH model. Then, whether stock returns and stock returns volatility are related with trading volume changes and trading volume changes volatility a few days earlier, the relationship between is analyzed. The results of distributed lag model show that lagged trading volume changes and lagged trading volume changes volatility are significantly related with current stock returns volatility but, not with current stock returns. These empirical results are consistent with the existence of information effect of trading volume in forecasting stock returns volatility.

주식수익률 조건부 이분산성의 행태에 관한 연구

정재엽 계명대학교 산업경영연구소 2000 經營經濟 Vol.33 No.1

This paper analyze the behavior of conditional heteroscedasticity in stock returns to find seasonal patterns in volatility. Using GARCH-m and EGARCH model, estimation of the conditional heteroscedastlcity in daily excess returns of KOSPI is performed from April 1989 to March 1999. Then conditional heteroscedasticity differences between months are examined by ANOVA and multiple comparison analysis. Empirical results here show that there are statistically significant conditional heteroscedasticity differences between months. Especially, the highest conditional heteroscedasticity months are December and January. These results indicate the existence of seasonality in stock returns volatility.